CN102288616A - Device and method for detecting workpiece appearance defects - Google Patents

Device and method for detecting workpiece appearance defects Download PDF

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Publication number
CN102288616A
CN102288616A CN2011102626497A CN201110262649A CN102288616A CN 102288616 A CN102288616 A CN 102288616A CN 2011102626497 A CN2011102626497 A CN 2011102626497A CN 201110262649 A CN201110262649 A CN 201110262649A CN 102288616 A CN102288616 A CN 102288616A
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China
Prior art keywords
image
workpiece
open defect
unit
horizontal rotary
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CN2011102626497A
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CN102288616B (en
Inventor
何金洲
周寿林
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Chengdu Galaxy Magnets Co Ltd
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Chengdu Galaxy Magnets Co Ltd
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Abstract

The invention discloses a device and method for detecting workpiece appearance defects, belonging to the technical field of workpiece appearance defect detection. The device comprises a detection platform and an imaging system, wherein the imaging system comprises an auxiliary light source, an optical imaging lens group and a camera; the camera is connected with a computer with an image acquisition system; the detection platform comprises a transparent horizontal rotary worktable; the imaging system comprises an upper imaging system and a lower imaging system; the upper imaging system is arranged at the inclined upward side of the detection platform; and the lower imaging system is arranged below the transparent horizontal rotary worktable. The device provided by the invention has the advantages of simple structure, convenience for operation and high detection efficiency; moreover, the device and method provided by the invention are particularly suitable for applying to appearance detection occasions of all surfaces of ring woekpieces produced in large quantities.

Description

A kind of workpiece open defect pick-up unit and detection method thereof
Technical field
The present invention relates to a kind of workpiece open defect pick-up unit, especially relate to a kind of annular workpieces open defect pick-up unit and detection method thereof.
Background technology
Open defect for the annular workpieces all surface detects the general manual method that adopts, such as, magnifier or microexamination are perhaps adopted in artificial visual check, and this inspection method efficient is lower, can not satisfy the demand of checking in batches.China utility model patent ZL200520048185.X, invention and created name is " a kind of bonding rare earth magnet appearance defect image automatic tester ", its technical scheme is once to comprise feed mechanism, first testing agency, inversion mechanism, second testing agency and conveying mechanism according to workflow; Described first testing agency comprises first gearshift, first image system and first detection platform; Described second testing agency comprises second gearshift, second image system and second detection platform; Described conveying mechanism is a conveying belt; Described first, second image system comprises secondary light source, image optics mirror group and high-speed CCD camera respectively, and described camera is connected with the computing machine that has image pick-up card, and described image system is separately positioned on the top of detection platform.Though this device can be realized automatic detection, be switching mechanism owing to there is inversion mechanism, make and detect very complexity of operation that detection efficiency is low.
Summary of the invention
One of purpose of the present invention has been to provide a kind of workpiece switching mechanism of cancelling still can realize each surface of workpiece is detected, and the workpiece open defect pick-up unit that operation is simple, efficient, robotization detects.Two of purpose of the present invention has been to provide a kind of detection method of described workpiece open defect pick-up unit.
One of technical scheme of the present invention is: a kind of workpiece open defect pick-up unit, comprise detection platform, and image system, described image system comprises secondary light source, image optics mirror group and camera, described camera is connected with the computing machine that has image capturing system, and described detection platform comprises transparent horizontal rotary table; Described image system comprises image system and following image system, and wherein, last image system is positioned at the oblique upper of detection platform, and following image system is positioned at the below of transparent horizontal rotary table.
Described transparent horizontal rotary table drives by motor synchronous.
The described image system of going up comprises at least two image systems.Be convenient to workpiece is carried out the image collection of different azimuth.
On the described transparent horizontal rotary table centralizer is housed.Described centralizer is used for the clamping workpiece for measurement.
Described centralizer comprises round base, the lower end of described pedestal is provided with the circular mounting hole, the upper end of described pedestal is provided with at least 3 positioning tooths, described each positioning tooth is extended to the center by susceptor edges, the crown of all positioning tooths coexists on the circumference on the pedestal, the centering diameter of a circle that the crown of described positioning tooth forms is suitable with the external diameter of waiting to press from both sides workpiece, and described centering circle is concentric with described circular mounting hole.
The upper surface of described positioning tooth is the inclined-plane, and promptly the tooth root of positioning tooth is to the attenuation gradually of crown thickness.This architectural feature can be when gathering the workpiece image, reduces positioning tooth to the blocking of workpiece short transverse, and also is convenient to workpiece simultaneously and slips in the internal point.
The tooth root of described positioning tooth narrows down gradually to the crown width.This architectural feature can reduce positioning tooth blocking the workpiece circumferencial direction when gathering the workpiece image.
The lower surface of described positioning tooth flushes.This architectural feature is the outward appearance that this positioning fixture easy to use detects workpiece.
As preferably a kind of, chamfering is being located near excircle of workpiece week in the upper surface of described positioning tooth crown and/or lower surface.Not only can reduce anchor clamps to the blocking of corner angle outside the workpiece lower surface, and the surface of contact of minimizing and workpiece, scratch workpiece outside surface avoided.
Be provided with the breach of being convenient to image collection between every adjacent positioned tooth on the described round base.This architectural feature can be so that positioning tooth can not block workpiece when gathering the workpiece image.
As preferably a kind of, described positioning tooth evenly distributes around the pedestal center.This distribution equalizing structure can be so that make simpler.Be evenly distributed with 4 positioning tooths on the described pedestal, be convenient to workpiece is felt relieved fast.
The work of described computer control image acquisition system and the action of transparent horizontal rotary table.
The diameter of a circle that the crown of described positioning tooth forms is less than the diameter in described circular mounting hole.This architectural feature is to be convenient to the surface of further carrying out that workpiece is put in behind the centralizer detect.
Two of technical scheme of the present invention is: a kind of detection method of workpiece open defect pick-up unit comprises the steps:
A, workpiece for measurement is put on the transparent horizontal rotary table of the centering circle that the crown of positioning tooth described in the centralizer forms;
B, computing machine send instruction, described transparent horizontal rotary table rotation, and workpiece for measurement is along with transparent horizontal rotary table rotation;
C, computing machine send instruction, described upper surface, internal circular surfaces and the outer round surface that image system is taken workpiece for measurement, the image of acquisition workpiece upper surface, internal circular surfaces and outer round surface shooting area gone up; Described image system is down taken the lower surface of workpiece for measurement, obtains the image of workpiece lower surface shooting area;
D, described image are handled by image capturing system in the computing machine and are obtained result, thereby the open defect of finishing the workpiece all surface detects.
The present invention compared with prior art has following technique effect: pick-up unit of the present invention is simple in structure, be convenient to operation, detect reliable, be suitable for producing in enormous quantities the detection of workpiece, because pick-up unit has used transparent rotary table cleverly, need not again the workpiece upset can be realized the detection of workpiece lower surface, improved detection efficiency.Detection method of the present invention is very simple, and workpiece is placed on monitor station, only needs to give instruction of computing machine, need not the workpiece upset can be realized the defects detection to all surface of workpiece, and the detection efficiency height.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the perspective view of pick-up unit of the present invention;
Fig. 2 is the structural representation of centralizer among Fig. 1;
Fig. 3 is an A-A cut-open view among Fig. 2;
Fig. 4 is the perspective view of centralizer among Fig. 1;
Reference numeral is as follows, and 1 is pedestal, and 2 is positioning tooth, 101 is the circular mounting hole, and 102 is breach, and 201 is the circle of the pointed one-tenth of positioning tooth, 202 is the inclined-plane, and 203 is tooth root, and 204 is crown, 205 is the lower surface of positioning tooth, 3 is transparent horizontal rotary table, and 4 is camera, and 5 is secondary light source, 6 is detection platform, and 7 is centralizer.
Embodiment
Disclosed all features in this instructions, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
As shown in Figure 1 and Figure 4, a kind of workpiece open defect pick-up unit, comprise detection platform 6, and image system, described image system comprises secondary light source 5, image optics mirror group and camera 4, described camera 4 is connected with the computing machine that has image capturing system, and described detection platform 6 is provided with transparent horizontal rotary table 3, and the transparent horizontal rotary table 3 in the present embodiment adopts disc-shaped structure.Transparent horizontal rotary table 3 is rotated by driven by motor.Centralizer 7 is housed on the detection platform 6, and the circular mounting hole 101 of centralizer 7 is coaxial with transparent horizontal rotary table 3; Described image system comprises image system and following image system, and wherein, last image system is positioned at the oblique upper of detection platform, and following image system is positioned at the below of transparent rotary table.The described image system of going up comprises two image systems, and each image system comprises image optics mirror group, camera and suitable with it secondary light source.Owing to adopt transparent horizontal rotary table 3, need not again the workpiece upset can be realized the detection of workpiece lower surface, improved detection efficiency.
Wherein, the structure of image optics mirror group and camera itself belongs to prior art, does not repeat them here.
Shown in Fig. 2-4, (present embodiment adopts 4 positioning tooth structures), described centralizer 7, comprise round base 1, the lower end of described pedestal 1 is provided with circular mounting hole 101, when centralizer was installed, described circular mounting hole 101 was loaded on the detection platform 6, and the circular mounting hole 101 of centralizer 7 is coaxial with transparent horizontal rotary table 3.Described pedestal 1 be provided with 4 positioning tooths 2, described 4 positioning tooths 2 evenly distribute around the center of pedestal 1, described each positioning tooth 2 is extended to the center by susceptor edges, the crown 204 of all positioning tooths 2 coexists on the circumference on the pedestal 1, the diameter of the centering circle 201 that the crown 204 of described positioning tooth 2 forms is suitable with the external diameter of waiting to press from both sides workpiece, and described centering circle 201 is concentric with described circular mounting hole 101.The diameter of the circle 201 that the crown 204 of described positioning tooth 2 forms is less than the diameter in described circular mounting hole 101.The upper surface of described positioning tooth 2 is inclined-plane 202, and promptly the tooth root 203 of positioning tooth 2 is to the attenuation gradually of crown 204 thickness.The tooth root 203 of described positioning tooth 2 narrows down gradually to crown 204 width.The lower surface 205 of described all positioning tooths 2 flushes, so that with transparent horizontal rotary table 3 on the plane suitable, between the plane micro gap is arranged on the lower surface 205 of described all positioning tooths 2 and the transparent horizontal rotary table 3, make that the plane does not contact on lower surface 205 and the transparent horizontal rotary table 3 of described all positioning tooths 2.Be provided with the breach 102 of being convenient to image collection on the described round base 1 between every adjacent positioned tooth.
The action of the work of described computer control image acquisition system and transparent horizontal rotary table 3.
The detection method of described a kind of workpiece open defect pick-up unit comprises the steps:
A, workpiece for measurement is put on the transparent horizontal rotary table 3 of the centering circle 201 that the crown 204 of positioning tooth described in the centralizer 2 forms; When centralizer is installed, described circular mounting hole 101 is loaded on the detection platform 6, and the circular mounting hole 101 of centralizer 7 is coaxial with transparent horizontal rotary table 3, then workpiece for measurement is put into the centering circle 201 of crown 204 formation of positioning tooth described in the centralizer 2, realized the quick centering of workpiece for measurement;
B, computing machine send instruction, described transparent horizontal rotary table 3 rotations, and workpiece for measurement is along with transparent horizontal rotary table 3 rotations;
C, computing machine send instruction, described upper surface, internal circular surfaces and the outer round surface that image system is taken workpiece for measurement, the image of acquisition workpiece upper surface, internal circular surfaces and outer round surface shooting area gone up; Described image system is down taken the lower surface of workpiece for measurement, obtains the image of workpiece lower surface shooting area;
D, described image are handled by image capturing system in the computing machine and are obtained result, thereby the open defect of finishing the workpiece all surface detects.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.

Claims (10)

1. workpiece open defect pick-up unit, comprise detection platform, and image system, described image system comprises secondary light source, image optics mirror group and camera, described camera is connected with the computing machine that has image capturing system, it is characterized in that described detection platform comprises transparent horizontal rotary table; Described image system comprises image system and following image system, and wherein, last image system is positioned at the oblique upper of detection platform, and following image system is positioned at the below of transparent horizontal rotary table.
2. a kind of workpiece open defect pick-up unit according to claim 1 is characterized in that, the described image system of going up comprises at least two image systems.
3. a kind of workpiece open defect pick-up unit according to claim 2 is characterized in that, on the described transparent horizontal rotary table centralizer is housed.
4. a kind of workpiece open defect pick-up unit according to claim 3, it is characterized in that, described centralizer comprises round base (1), the lower end of described pedestal (1) is provided with circular mounting hole (101), the upper end of described pedestal (1) is provided with at least 3 positioning tooths (2), described each positioning tooth (2) is extended to the center by susceptor edges, the crown (204) of last all positioning tooths (2) of pedestal (1) coexists on the circumference, the diameter of the centering circle (201) that the crown (204) of described positioning tooth (2) forms is suitable with the external diameter of waiting to press from both sides workpiece, and described centering circle (201) is concentric with described circular mounting hole (101).
5. a kind of workpiece open defect pick-up unit according to claim 4 is characterized in that the upper surface of described positioning tooth (2) is inclined-plane (202), and promptly the tooth root (203) of positioning tooth (2) is to the attenuation gradually of crown (204) thickness.
6. a kind of workpiece open defect pick-up unit according to claim 5 is characterized in that the tooth root (203) of described positioning tooth (2) narrows down gradually to crown (204) width.
7. a kind of workpiece open defect pick-up unit according to claim 6 is characterized in that the lower surface of described positioning tooth (2) flushes.
8. a kind of workpiece open defect pick-up unit according to claim 7 is characterized in that, described round base (1) is gone up between every adjacent positioned tooth and is provided with the breach (102) of being convenient to image collection.
9. according to any described a kind of workpiece open defect pick-up unit of claim 1-8, it is characterized in that the work of described computer control image acquisition system and the action of transparent horizontal rotary table.
10. as the detection method of the described a kind of workpiece open defect pick-up unit of claim 1-9, it is characterized in that, comprise the steps:
A, workpiece for measurement is put on the transparent horizontal rotary table of the centering circle (201) that the crown (204) of positioning tooth described in the centralizer (2) forms;
B, computing machine send instruction, described transparent horizontal rotary table rotation, and workpiece for measurement is along with transparent horizontal rotary table rotation;
C, computing machine send instruction, described upper surface, internal circular surfaces and the outer round surface that image system is taken workpiece for measurement, the image of acquisition workpiece upper surface, internal circular surfaces and outer round surface shooting area gone up; Described image system is down taken the lower surface of workpiece for measurement, obtains the image of workpiece lower surface shooting area;
D, described image are handled by image capturing system in the computing machine and are obtained result, thereby the open defect of finishing the workpiece all surface detects.
CN201110262649.7A 2011-09-06 2011-09-06 Device and method for detecting workpiece appearance defects Active CN102288616B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104122264A (en) * 2013-04-25 2014-10-29 鸿富锦精密工业(深圳)有限公司 Appearance flaw detection system and method
CN110038822A (en) * 2019-04-20 2019-07-23 东莞中科蓝海智能视觉科技有限公司 The visible detection method of reflective annulus part

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TW200419162A (en) * 2003-03-19 2004-10-01 Right Tek System Co Ltd Apparatus for inspecting electric products using vision system
CN2660522Y (en) * 2003-11-21 2004-12-01 宁波韵升股份有限公司 Manually operated high precision internal hole optical detector
CN2852116Y (en) * 2005-12-29 2006-12-27 上海爱普生磁性器件有限公司 Automatic image detector for appearance defect of bonding rare earth magnet
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104122264A (en) * 2013-04-25 2014-10-29 鸿富锦精密工业(深圳)有限公司 Appearance flaw detection system and method
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CN110038822A (en) * 2019-04-20 2019-07-23 东莞中科蓝海智能视觉科技有限公司 The visible detection method of reflective annulus part

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